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AS-Prepend, AS-Expand

AS-Prepend, AS-Expand

Created: Mar 10, 2020 14:48:11Latest reply: Jun 7, 2020 13:37:47 564 5 0 0 0
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Hello,


I would like to know if S6730 has the resource of AS-Prepend or AS-Expand.


The aim is to advertise a route with the correct ASN like this (PE-B is a Huawei S6730):


AS-Prepend


In this example, PE-A generates 192.168.64.0/20 prefix (that belongs to AS200) and advertise it via iBGP (the BGP session runs between AS300).


Then PE-B advertises it like AS300 + AS200 prepend.



S6730eBGPiBGPbgp

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chenhui
Admin Created Mar 11, 2020 00:55:41

Hi @ptomasi,
Yes, you can configure the route policy to do that, kindly refer to the example below:

acl 2001
 rule 5 per sourc 192.168.64.0 0.0.15.255
route-policy 2EBGP per node 10
 if-match acl 2001
 apply as-path 200 additive
bgp 300
 peer x.x.x.x route-policy 2EBGP exp

If you have any further questions, kindly let us know.

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chenhui
chenhui Admin Created Mar 11, 2020 00:55:41

Hi @ptomasi,
Yes, you can configure the route policy to do that, kindly refer to the example below:

acl 2001
 rule 5 per sourc 192.168.64.0 0.0.15.255
route-policy 2EBGP per node 10
 if-match acl 2001
 apply as-path 200 additive
bgp 300
 peer x.x.x.x route-policy 2EBGP exp

If you have any further questions, kindly let us know.

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ptomasi
ptomasi Created Mar 11, 2020 13:41:48

Thank you very much, @chenhui


I've made the Lab on eNSP:


BGP Prepend Lab

It worked exactly as you said:


Display BGP



From R4 (AS 800) perspective the AS-Path to 192.168.64.0/20 prefix is 700,300,200.


i_f48.gif


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chenhui
chenhui Admin Created Mar 12, 2020 06:08:19

Posted by ptomasi at 2020-03-11 13:41 Thank you very much, @chenhuiI've made the Lab on eNSP:It worked exactly as you said:From R4 (AS 800 ...
My pleasure. :D
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anyeEE
anyeEE Created Jun 7, 2020 13:37:36

thank you!
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anyeEE
anyeEE Created Jun 7, 2020 13:37:47

Great job!
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